Search

Previous research indicates that men can accurately assess women’s mating orientation from facial photographs (DeLecce et al. Archives of Sexual Behavior, 43, 319–327, 2014). The current study investigated whether this ability is moderated by men’s own mating orientation. To that end, 89 men completed the Sociosexual Orientation Inventory (SOI)—an assessment of mating orientation—and rated the perceived faithfulness of 55 women (who also completed the SOI) depicted in facial photographs. Although men were indeed accurate in their faithfulness perceptions of the female targets, men’s mating orientation did not moderate the negative association between their faithfulness ratings and the self-reported mating orientation of the female targets. Limitations of the current study and directions for future research are addressed in the discussion.

Female sexual orientation has received less theoretical and empirical attention than male sexual orientation and few reviews are devoted to female sexual orientation. Moreover, research investigating female sexual orientation often underappreciates insights afforded by evolutionary theory. This review begins with an overview of the literature on female sexual identification, sexual perception, sexual fluidity, sexual expression, and the biology of female sexual orientation. Female same-sex sexual behaviors in the non-human apes are then described, providing a comparative context for the following discussion of hypotheses for the evolution of human female same-sex sexual attractions and behaviors. These hypotheses are organized as byproduct hypotheses or adaptation hypotheses and we include discussions of dysfunction, heterosis, sexual antagonism, epigenetics, weak selection, self-domestication, sexual frustration, mate attraction, alloparenting, polygyny, and other topics. We conclude by highlighting the challenges posed by evolutionary studies of human psychology.

Research has documented sex differences in risk-taking behavior, and young men in particular are more prone than women to engage in activities associated with physical risks. Evolutionary scientists have proposed that this sex difference is a consequence of male competition over mating opportunities. Thus, mating motives promote risk-taking in men more than in women. Here, we report analyses of assessments of male physical risk-taking in a Russian sample (n = 546). Men and women judged vignettes describing men who differed in risk-taking propensity for short- and long-term attractiveness, provisioning quality, and aggression. Risk-taking propensity had an effect on all attributes. Occasional (but not high) risk-takers received the highest ratings on short-term attractiveness. Low risk-takers were judged highest on long-term attractiveness and provisioning quality. High risk-takers were judged as more aggressive than occasional and low risk-takers. Thus, male risk-taking behavior affects assessments of male quality, but high risk-taking is not regarded as positive. We discuss the results with reference to evolutionary investigations of risk-taking behavior and cultural characteristics of masculinity ideology.

Humans perform copulatory behaviors that do not contribute directly to reproduction (e.g., cunnilingus, prolonged copulation). We conducted a content analysis of pornography to investigate whether such behaviors might contribute indirectly to reproduction by influencing ejaculate volume—an indicator of ejaculate quality. We coded 100 professional pornography scenes depicting the same male actor copulating with 100 different females, affording control for between-male differences in estimated ejaculate volume. Coders visually estimated ejaculate volume and recorded the time the actor spent engaged in cunnilingus, penile-vaginal penetration, and in any physical contact with his partner. We found support for the hypothesis that a man who spends more time performing cunnilingus produces an ejaculate with greater estimated volume, even after controlling statistically for the age and attractiveness of the actress, and time spent in physical contact with his partner. Additionally, we tested the ejaculate adjustment hypothesis for prolonged copulation and found no support. Prolonged copulation does not facilitate production of an ejaculate with greater estimated volume, even after controlling statistically for time spent in physical contact with a partner. This research is the first to use content analysis to document that pre-ejaculatory copulatory behavior predicts estimated ejaculate volume and also is the first to document a relationship between the time spent performing cunnilingus and ejaculate quality.

Joiner, Hom, Hagan, and Silva (Psychological Review, 123, 235–254, 2016) argue that human suicidal behavior is an evolutionarily maladaptive byproduct of eusociality. We believe that Joiner et al. are committing the moralistic fallacy in their analysis of human suicidal behavior, which may have led to a number of unexamined assumptions and possible errors in their discussion. Specifically, it is because of the moralistic fallacy—i.e., the conflation between that which is socially desirable and that which is in keeping with inclusive fitness concerns—that Joiner et al. dismiss the possibility that suicide may sometimes bring reproductive benefits to individuals via its effect on suicidal individuals’ family members.

Recent research on women’s ratings of men’s dance movements indicates that women derive similar cues of male “quality” (e.g., physical strength) from movement as from faces and bodies. Whether this extends to personality assessment is yet unclear. We recorded dance movements of 80 men using 3D optical motion-capture technology and secured self-reports of men’s personality standings. Dance movements were applied to a uniform, shape-standardized virtual humanoid character (avatar) and presented to women as 15-s videos for attractiveness and personality ratings. Women’s ratings of dance attractiveness correlated negatively with men’s self-reports and women’s ratings of men’s neuroticism and were positively correlated with men’s self-reported extraversion and women’s ratings of men’s conscientiousness. Men’s self-reported personality scores did not correlate with women’s ratings of men’s personality standings. Findings are discussed with reference to previous research and the social significance of dance movement cues and impression formation.

Mate retention behaviors are designed to reduce the likelihood of partner infidelity and relationship termination. Measures of mate retention historically have focused on individual mate retention—behaviors that individuals perform alone. The current research explores coalitional mate retention (CMR)—mate retention with assistance from allies. Using an act nomination procedure, we constructed the CMR Inventory (CMRI) to assess specific CMR behaviors. In study 1, participants (n = 100) provided open-ended responses in which they nominated CMR behaviors. In study 2, participants (n = 387) provided frequency reports on the 44 CMR behaviors identified in study 1. We conducted principal component analyses to guide construction of the CMRI, which assesses seven components of CMRI: manipulation (e.g., “got my partner drunk to see what my partner said”), praise (e.g., “said nice things about me when my partner and other people were around”), vigilance (e.g., “observed how my partner acted around people interested in my partner”), monopolizing time (e.g., “accompanied my partner to a party”), therapy (e.g., “told my partner how much I liked my partner”), gifts (e.g., “told me what gifts my partner wanted”), and violence (e.g., “hit someone who was flirting with my partner”). Discussion highlights the limitations of focusing exclusively on individual mate retention and the importance of considering alliances when researching mate retention.

Although Ng (2016) addresses the important question of how to increase animal welfare, he does not address an equally important question—how to prevent animal suffering. The best way to prevent animal suffering is to stop breeding them. With fewer sentient beings in existence, net suffering is lessened. Even if captive animals were bred with a guarantee of “net happiness,” they would still suffer at some point in their lives and sometimes very much. We argue that not only is nonexistence preferable to existence but also that even in research there are many preferable alternatives to the use of captive animals.

Human dance may have originated from selection to display quality in courtship. This proposal is based on comparative investigation of variation in motor skills in relation to mate preference and selection. However, scholars have also proposed that dance has evolved as a by-product of imitative proficiency. In this view, imitative proficiency plays a central role in dance learning and performance and facilitates movement synchronization among dancers and thus social bonding. Here we comment on a recent paper (Laland et al. in Current Biology, 26, R5–R9, 2016), which favors the latter perspective. We suggest that social bonding through dance has evolved in consequence of the adaptive problem of assessing mate qualities and other social information from body movement. This information may then have been used in strengthening social cohesion.